Ashley,
Again, I agree wholeheartedly. If you ever find yourself in this position (wanting to be honest and straight forward, but foreseeing obstacles), try this. Discuss with the student the issue of concern (in the context of the field, not in the context of their disability), and then ask, "have you thought about how you would approach accomplishing something like that?" Help the student think through both options and barriers.
Dr. Jane Jarrow